[ 5.334548] Waiting 300 sec before mounting root device...
This is not a kernel issue, but an emergent bug from the combination of
us specifying rootdelay=300 in azure images, and the fact that the
minimal image boots initramfsless. The kernel interprets 'rootdelay'
differently than Ubuntu initramfs-tools does.
** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1795017
Title:
linux-azure on cosmic minimal image boot speed
Status in linux-azure package in Ubuntu:
Invalid
Bug description:
Hi,
We're planning to share a new Cosmic minimal image for Azure including
the linux-azure custom kernel.
I have found boot speed increase from ~55s in non minimal image to
over 6mins for minimal image.
I have gathered boot log, systemd logs and cloud-init logs for this
instance @ https://private-fileshare.canonical.com/~philroche/azure-
cosmic-20180927/minimal/. You can see the same logs for the non
minimal image @ https://private-fileshare.canonical.com/~philroche
/azure-cosmic-20180927/base
Most of the time seems to be spent in crng and "task swapper/0:1" (?)
[ 5.774760] sd 3:0:0:0: [sdc] Attached SCSI disk
[ 71.388989] random: crng init done
[ 242.656057] INFO: task swapper/0:1 blocked for more than 120 seconds.
[ 242.688434] Not tainted 4.15.0-1018-azure #18-Ubuntu
Source: https://private-fileshare.canonical.com/~philroche/azure-
cosmic-20180927/minimal/iengal3seeSee-vm-imagedebug-boot.log
Please let me know if you need any more information or would like me
to launch an instance for testing.
I understand that minimal images are intended to boot without initramfs but I
did install initramfs-tools in another test image which did result in much
better boot times.
See https://private-fileshare.canonical.com/~philroche/azure-
cosmic-20180928/ for logs.
Minimal image boot time 48.784s
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